My name is Louis and I'm glad to be part of this group. I am relatively new to home theater but I find myself getting deeper into everyday. I have been looking to upgrading my low frequency and have looked at several options: 4 Sealed 18"s, a couple LLT 18" (marty sub specifically) and I read about the TUBA HT last night. It sounded like a great solution so I bought the plans to build it. I went to home depot and Lowes to try to price out the wood but they didn't have the Auraco ACX that was recommended. However, they did have the types of plywood that were recommended to NOT use. With that being said, whats the best option that would be available at either of these locations? Hope to learn as much as possible here in this forum and get to building ASAP! thanks.